Filewatcher nodejs

const events = require("events"),
  util = require("util");

const fs = require("fs"),
  watchDir = "./watch",
  processedDir = "./done";
  
  /*Let's extend events.EventEmitter in order to be able
  to emit and listen for event*/
  
  class Watcher extends events.EventEmitter {
  constructor(watchDir, processedDir) {
    super();
    this.watchDir = watchDir;
    this.processedDir = processedDir;
  }

/* Cycles through directory and process any file
found emitting a process event for each one*/

  watch() {
    const watcher = this;
    fs.readdir(this.watchDir, function(err, files) {
      if (err) throw err;
      for (let index in files) {
        watcher.emit("process", files[index]);
      }
    });
  }

/* Start the directory monitoring 
leveraging Node's fs.watchFile */

  start() {
    var watcher = this;
    fs.watchFile(watchDir, function() {
      watcher.watch();
    });
  }
}
 
 /* Let's instantiate our Watcher object 
 passing to the constructor our folders path */
 
let watcher = new Watcher(watchDir, processedDir);


/*Let's use the on method inherited from 
event emitter class to listen for process 
events and move files from source folder 
to destination*/

watcher.on("process", function process(file) {
  const watchFile = this.watchDir + "/" + file;
  const processedFile = this.processedDir + "/" + file.toLowerCase();
  fs.rename(watchFile, processedFile, function(err) {
    if (err) throw err;
  });
});

/*Start it!!!*/

watcher.start();

Source: codementor.io

Similar codes

0 vote319 views1 answer
Get external api node js
Javascript Node.js
11 votes340 views2 answers
Node js get files in dir
Javascript Node.js
20 votes392 views4 answers
Use node js to check if a json file exists
Javascript Node.js
0 vote330 views3 answers
Latitude and longitude distance calculate in node js
Javascript Node.js
3 votes311 views2 answers
Node express json request urlencoded
Javascript Node.js
9 votes318 views2 answers
Nodejs dirname
Javascript Node.js
1 vote287 views1 answer
Onclick node js
Javascript Node.js
0 vote310 views1 answer
Node js catch any errors
Javascript Node.js
-1 vote317 views1 answer
Node package.json type module
Javascript Node.js
1 vote316 views1 answer
Nodejs global
Javascript Node.js